* {
	margin: 0;
	padding: 0;
	}

body {
	/* 引入后缀名为gif的背景图片 */
	background-image: url(../img/星空.gif);
	background-position: center;
	background-size: cover;
	background-repeat: no-repeat;
	min-height: 50vh;
	color: white;
}

/* 为整体的表单定义位置 */
form {
	width: 50%;
	margin: 60px auto;
}

legend {
	padding-top: 30px;
	font-size: 30px;
	font-weight: bold;
	text-align: center;
	color: whitesmoke;
	text-shadow: 1px 3px 5px black;
}

#main {
	text-align: center;
	background-color: rgba(0, 153, 51, 0.5);
	border-radius: 10px;
	border: none;
	box-shadow: 2px 2px 8px whitesmoke;
	height: 350px;

}

.font {
	margin-top: 60px;
}

/* 对按钮进行设计 */
.sure {
	background-color: dodgerblue;
	margin-right: 30px;
}

.return {
	background-color: orange;
}

.all {
	border: none;
	border-radius: 5px;
	margin-top: 40px;
	color: white;
	width: 70px;
	height: 25px;
	font-size: 10px;
}

/* 鼠标置于按钮上发生变化 */
.all:hover {
	box-shadow: 2px 2px 5px whitesmoke;
}

input {
	background-color: rgba(255, 255, 255, 0.8);
	border: none;
}
